My 360 sounds like a sewing machine

Dodge72 said

I also have a aftermarket dipstick for the oil. Has anybody found these to be inaccurate or are they fairly reliable?

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Best way to verify is during your next oil change.
Completely drain old oil and put in the exact volume designed for your oil pan, then check the level shown on the dipstick to see if it is at the 'FULL' mark.